My advice: Use Google Translate! And make sure you open the Translate app on your phone in advance and download all the goodies for whatever language you're going to be translating. That's how you get the new capability.

Also note that while the new offline translation is better than the old one thanks to this new feature, it's still not as good as the online version. So use Translate while connected when it's possible or reasonable to do so.

The offline neural machine translation feature will be rolled out for 59 languages over the next few days, so make sure you get it!